{"id":6791,"date":"2016-11-17T20:55:51","date_gmt":"2016-11-17T20:55:51","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=6791"},"modified":"2016-11-26T10:07:48","modified_gmt":"2016-11-26T10:07:48","slug":"non-lune-nest-blanche-a-lhorizon","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/11\/17\/non-lune-nest-blanche-a-lhorizon\/","title":{"rendered":"Non, la Lune n’est pas blanche \u00e0 l’horizon !"},"content":{"rendered":"

De nombreuses photographies de la Super Lune qui ont circul\u00e9 sur les r\u00e9seaux sociaux sont en r\u00e9alit\u00e9 des montages maladroits. Explications.<\/strong><\/p>\n

Vous avez sans doute vu passer beaucoup d’images de notre satellite naturel le 14 novembre<\/a>. Les m\u00e9dias faisant leur une en annon\u00e7ant la plus grosse Pleine Lune depuis 1948, chacun a voulu immortaliser le ph\u00e9nom\u00e8ne. Mais comme la m\u00e9t\u00e9o n’\u00e9tait pas tr\u00e8s favorable, certains photographes ont cr\u00e9\u00e9 leurs propres images en int\u00e9grant une photo de notre satellite naturel dans un clich\u00e9 de paysage, souvent en pla\u00e7ant sur l’horizon une Lune photographi\u00e9e en plein ciel \u00e0 une autre occasion. Petit probl\u00e8me : \u00e0 l’horizon la Lune n’est pas blanche, et voici pourquoi.<\/p>\n

Lorsque la Lune est basse sur l’horizon (c’est aussi le cas pour le Soleil <\/a>et les \u00e9toiles<\/a>), ses rayons lumineux doivent traverser une couche atmosph\u00e9rique bien plus \u00e9paisse que lorsque elle est au z\u00e9nith.<\/p>\n

\"moon10\"<\/a><\/p>\n

Les rayons ont alors beaucoup plus de risques d’\u00eatre d\u00e9vi\u00e9s par les mol\u00e9cules gazeuses qu’ils rencontrent. Mais ces d\u00e9viations varient selon les longueurs d’onde : ce sont les photons de courte longueur d’onde (violet-bleu) qui sont les plus diffus\u00e9s (ce qui donne au ciel sa couleur bleue), \u00e0 la diff\u00e9rence des photons de grande longueur d’onde (rouge-orange).<\/p>\n

\"rayon\"<\/a><\/p>\n

Ce ph\u00e9nom\u00e8ne est connu sous le nom de diffusion Rayleigh, du nom du physicien anglais qui le d\u00e9couvrit \u00e0 la fin du XIXe si\u00e8cle (ses travaux sur la densit\u00e9 des gaz et la d\u00e9couverte de l’argon lui vaudront le prix Nobel de physique en 1904).<\/p>\n

\"moon3\"<\/a><\/p>\n

C’est la diffusion Rayleigh qui nous fait voir le Soleil orange ou rouge quand il se l\u00e8ve et se couche, tout comme la Lune, et nous constaterions le m\u00eame ph\u00e9nom\u00e8ne avec les \u00e9toiles si notre \u0153il \u00e9tait assez sensible : \u00e0 l’horizon l’\u00e9paisseur de la couche atmosph\u00e9rique travers\u00e9e par le rayonnement est tellement importante que les courtes longueurs d’onde sont totalement diffus\u00e9es et que l’on ne voit alors plus que les longueurs d’onde les plus grandes (le rouge et l’orange).<\/p>\n

Les vraies images de lever ou de coucher de Pleine Lune qui illustrent cet article viennent confirmer ce ph\u00e9nom\u00e8ne !<\/p>\n

\"moon2\"<\/a><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

De nombreuses photographies de la Super Lune qui ont circul\u00e9 sur les r\u00e9seaux sociaux sont en r\u00e9alit\u00e9 des montages maladroits. Explications. Vous avez sans doute vu passer beaucoup d’images de notre satellite naturel le 14 novembre. Les m\u00e9dias faisant leur une en annon\u00e7ant la plus grosse Pleine Lune depuis 1948, chacun a voulu immortaliser le … Continuer la lecture de Non, la Lune n’est pas blanche \u00e0 l’horizon !<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":6793,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[83],"tags":[1939,89,109,1940,97,322],"class_list":["post-6791","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-la-lune","tag-diffusion-rayleigh","tag-etoile","tag-pleine-lune","tag-prix-nobel","tag-soleil","tag-super-lune"],"yoast_head":"\nNon, la Lune n'est pas blanche \u00e0 l'horizon !<\/title>\n<meta name=\"description\" content=\"De nombreuses photographies de la Super Lune qui ont circul\u00e9 sur les r\u00e9seaux sociaux sont en r\u00e9alit\u00e9 des montages maladroits. 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